feat(web): add Property Valuation UI with AVM integration

Build the valuation page at /dashboard/valuation with form input,
AI-powered price estimation results, comparable properties display,
and valuation history. Add "Dinh gia AI" button to listing detail
sidebar for quick per-listing estimates.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/lib/validations/valuation.ts

@@ -0,0 +1,35 @@
+import { z } from 'zod';
+
+export const VALUATION_PROPERTY_TYPES = [
+  { value: 'APARTMENT', label: 'Can ho' },
+  { value: 'HOUSE', label: 'Nha rieng' },
+  { value: 'VILLA', label: 'Biet thu' },
+  { value: 'LAND', label: 'Dat nen' },
+  { value: 'OFFICE', label: 'Van phong' },
+  { value: 'SHOPHOUSE', label: 'Shophouse' },
+] as const;
+
+export const CITIES = [
+  { value: 'Ho Chi Minh', label: 'TP. Ho Chi Minh' },
+  { value: 'Ha Noi', label: 'Ha Noi' },
+  { value: 'Da Nang', label: 'Da Nang' },
+] as const;
+
+export const valuationFormSchema = z.object({
+  propertyType: z.string().min(1, 'Vui long chon loai bat dong san'),
+  area: z.string().min(1, 'Vui long nhap dien tich').refine(
+    (val) => !isNaN(Number(val)) && Number(val) > 0,
+    'Dien tich phai lon hon 0',
+  ),
+  district: z.string().min(1, 'Vui long nhap quan/huyen'),
+  city: z.string().min(1, 'Vui long chon tinh/thanh pho'),
+  bedrooms: z.string().optional(),
+  bathrooms: z.string().optional(),
+  floors: z.string().optional(),
+  frontage: z.string().optional(),
+  roadWidth: z.string().optional(),
+  yearBuilt: z.string().optional(),
+  hasLegalPaper: z.boolean().optional(),
+});
+
+export type ValuationFormData = z.infer<typeof valuationFormSchema>;